i3
xcb.c
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1 /*
2  * vim:ts=4:sw=4:expandtab
3  *
4  * i3 - an improved dynamic tiling window manager
5  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
6  *
7  * xcb.c: Helper functions for easier usage of XCB
8  *
9  */
10 #include "all.h"
11 
12 unsigned int xcb_numlock_mask;
13 
14 /*
15  * Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking
16  * for errors.
17  *
18  */
19 xcb_window_t create_window(xcb_connection_t *conn, Rect dims,
20  uint16_t depth, xcb_visualid_t visual, uint16_t window_class,
21  enum xcursor_cursor_t cursor, bool map, uint32_t mask, uint32_t *values) {
22  xcb_window_t result = xcb_generate_id(conn);
23 
24  /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, we copy depth and
25  * visual id from the parent window. */
26  if (window_class == XCB_WINDOW_CLASS_INPUT_ONLY) {
27  depth = XCB_COPY_FROM_PARENT;
28  visual = XCB_COPY_FROM_PARENT;
29  }
30 
31  xcb_create_window(conn,
32  depth,
33  result, /* the window id */
34  root, /* parent == root */
35  dims.x, dims.y, dims.width, dims.height, /* dimensions */
36  0, /* border = 0, we draw our own */
37  window_class,
38  visual,
39  mask,
40  values);
41 
42  /* Set the cursor */
43  if (xcursor_supported) {
44  mask = XCB_CW_CURSOR;
45  values[0] = xcursor_get_cursor(cursor);
46  xcb_change_window_attributes(conn, result, mask, values);
47  } else {
48  xcb_cursor_t cursor_id = xcb_generate_id(conn);
49  i3Font cursor_font = load_font("cursor", false);
50  int xcb_cursor = xcursor_get_xcb_cursor(cursor);
51  xcb_create_glyph_cursor(conn, cursor_id, cursor_font.id, cursor_font.id,
52  xcb_cursor, xcb_cursor + 1, 0, 0, 0, 65535, 65535, 65535);
53  xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
54  xcb_free_cursor(conn, cursor_id);
55  }
56 
57  /* Map the window (= make it visible) */
58  if (map)
59  xcb_map_window(conn, result);
60 
61  return result;
62 }
63 
64 /*
65  * Draws a line from x,y to to_x,to_y using the given color
66  *
67  */
68 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
69  uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
70  xcb_change_gc(conn, gc, XCB_GC_FOREGROUND, (uint32_t[]){ colorpixel });
71  xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2,
72  (xcb_point_t[]) { {x, y}, {to_x, to_y} });
73 }
74 
75 /*
76  * Draws a rectangle from x,y with width,height using the given color
77  *
78  */
79 void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
80  uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
81  xcb_change_gc(conn, gc, XCB_GC_FOREGROUND, (uint32_t[]){ colorpixel });
82  xcb_rectangle_t rect = {x, y, width, height};
83  xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
84 }
85 
86 /*
87  * Generates a configure_notify_event with absolute coordinates (relative to the X root
88  * window, not to the client’s frame) for the given client.
89  *
90  */
92  xcb_rectangle_t absolute;
93  if (con->window == NULL)
94  return;
95 
96  absolute.x = con->rect.x + con->window_rect.x;
97  absolute.y = con->rect.y + con->window_rect.y;
98  absolute.width = con->window_rect.width;
99  absolute.height = con->window_rect.height;
100 
101  DLOG("fake rect = (%d, %d, %d, %d)\n", absolute.x, absolute.y, absolute.width, absolute.height);
102 
103  fake_configure_notify(conn, absolute, con->window->id, con->border_width);
104 }
105 
106 /*
107  * Sends the WM_TAKE_FOCUS ClientMessage to the given window
108  *
109  */
110 void send_take_focus(xcb_window_t window) {
111  /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
112  * In order to properly initialize these bytes, we allocate 32 bytes even
113  * though we only need less for an xcb_configure_notify_event_t */
114  void *event = scalloc(32);
115  xcb_client_message_event_t *ev = event;
116 
117  ev->response_type = XCB_CLIENT_MESSAGE;
118  ev->window = window;
119  ev->type = A_WM_PROTOCOLS;
120  ev->format = 32;
121  ev->data.data32[0] = A_WM_TAKE_FOCUS;
122  ev->data.data32[1] = XCB_CURRENT_TIME;
123 
124  DLOG("Sending WM_TAKE_FOCUS to the client\n");
125  xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
126  free(event);
127 }
128 
129 /*
130  * Raises the given window (typically client->frame) above all other windows
131  *
132  */
133 void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) {
134  uint32_t values[] = { XCB_STACK_MODE_ABOVE };
135  xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values);
136 }
137 
138 /*
139  * Configures the given window to have the size/position specified by given rect
140  *
141  */
142 void xcb_set_window_rect(xcb_connection_t *conn, xcb_window_t window, Rect r) {
143  xcb_void_cookie_t cookie;
144  cookie = xcb_configure_window(conn, window,
145  XCB_CONFIG_WINDOW_X |
146  XCB_CONFIG_WINDOW_Y |
147  XCB_CONFIG_WINDOW_WIDTH |
148  XCB_CONFIG_WINDOW_HEIGHT,
149  &(r.x));
150  /* ignore events which are generated because we configured a window */
151  add_ignore_event(cookie.sequence, -1);
152 }
153 
154 /*
155  * Returns true if the given reply contains the given atom.
156  *
157  */
158 bool xcb_reply_contains_atom(xcb_get_property_reply_t *prop, xcb_atom_t atom) {
159  if (prop == NULL || xcb_get_property_value_length(prop) == 0)
160  return false;
161 
162  xcb_atom_t *atoms;
163  if ((atoms = xcb_get_property_value(prop)) == NULL)
164  return false;
165 
166  for (int i = 0; i < xcb_get_property_value_length(prop) / (prop->format / 8); i++)
167  if (atoms[i] == atom)
168  return true;
169 
170  return false;
171 
172 }
173 
178 void xcb_warp_pointer_rect(xcb_connection_t *conn, Rect *rect) {
179  int mid_x = rect->x + (rect->width / 2);
180  int mid_y = rect->y + (rect->height / 2);
181 
182  LOG("warp pointer to: %d %d\n", mid_x, mid_y);
183  xcb_warp_pointer(conn, XCB_NONE, root, 0, 0, 0, 0, mid_x, mid_y);
184 }
185 
186 /*
187  * Set the cursor of the root window to the given cursor id.
188  * This function should only be used if xcursor_supported == false.
189  * Otherwise, use xcursor_set_root_cursor().
190  *
191  */
192 void xcb_set_root_cursor(int cursor) {
193  xcb_cursor_t cursor_id = xcb_generate_id(conn);
194  i3Font cursor_font = load_font("cursor", false);
195  int xcb_cursor = xcursor_get_xcb_cursor(cursor);
196  xcb_create_glyph_cursor(conn, cursor_id, cursor_font.id, cursor_font.id,
197  xcb_cursor, xcb_cursor + 1, 0, 0, 0, 65535, 65535, 65535);
198  xcb_change_window_attributes(conn, root, XCB_CW_CURSOR, &cursor_id);
199  xcb_free_cursor(conn, cursor_id);
200  xcb_flush(conn);
201 }
202 
203 /*
204  * Get depth of visual specified by visualid
205  *
206  */
207 uint16_t get_visual_depth(xcb_visualid_t visual_id){
208  xcb_depth_iterator_t depth_iter;
209 
210  depth_iter = xcb_screen_allowed_depths_iterator(root_screen);
211  for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
212  xcb_visualtype_iterator_t visual_iter;
213 
214  visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
215  for (; visual_iter.rem; xcb_visualtype_next(&visual_iter)) {
216  if (visual_id == visual_iter.data->visual_id) {
217  return depth_iter.data->depth;
218  }
219  }
220  }
221  return 0;
222 }
223 
224 /*
225  * Get visualid with specified depth
226  *
227  */
228 xcb_visualid_t get_visualid_by_depth(uint16_t depth){
229  xcb_depth_iterator_t depth_iter;
230 
231  depth_iter = xcb_screen_allowed_depths_iterator(root_screen);
232  for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
233  if (depth_iter.data->depth != depth)
234  continue;
235 
236  xcb_visualtype_iterator_t visual_iter;
237 
238  visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
239  if (!visual_iter.rem)
240  continue;
241  return visual_iter.data->visual_id;
242  }
243  return 0;
244 }